Jump on kijiji and try and find some that are less pounded out, or find some X package shocks and rebuild em, or find some Fox Floats, had them on my ZX and liked em a lot for that unit. 17" center to center I'm pretty sure.
Find a cheap set of HPG rebuildable off a MXZ......17" c to c, rebuild and revalve for your weight/riding style. Don't waste your $$ on Royals shocks.....they are not rebuildable. IMHO.